Fujitsu Air Conditioner 41 Error Code

Room temperature sensor error on Fujitsu air conditioners.

Fujitsu All Fujitsu air conditioner codes

May need a pro

The room air sensor at the indoor unit reads open, shorted or out of range. The sensor, its connector or the indoor board may be at fault.

Compatible models

Covered for Fujitsu's 2019-era wall-mounted, ducted (RGLX) and RLF multi-zone lines and the LZAH single-zone wall units.

Also shown as

Lamp pattern: Operation lamp 4 flashes, Timer lamp 1 flash. Listed as 41.1 in FGLair. On the older code set this fault used 02 or 03.

Difficulty

Try the basic checks, but the usual fix is a technician's job.

How to fix
When to call a pro
Parts
FAQ

Not sure you are reading the code right? See how to read Fujitsu air conditioner codes.

Safety first: unplug the air conditioner (or switch off its breaker) before touching filters, hoses or panels. If you smell burning or gas, or see water near the outlet, stop and call a professional.

How to fix Fujitsu 41

Reset the system
Do a breaker reset. Sensor faults rarely clear for good, but it rules out a glitch.
Note the code
If 41 returns, record it with the indoor model number.

When to call a technician

A technician needs to test the room thermistor's resistance and replace it or the board.

Parts linked to 41

These are the parts most often behind this code. Tap one to see what it does and the signs it is failing.

Order parts by your full model number so they fit.

Frequently asked questions

Which Fujitsu models show the 41 code?

Covered for Fujitsu's 2019-era wall-mounted, ducted (RGLX) and RLF multi-zone lines and the LZAH single-zone wall units.

Can I fix Fujitsu 41 myself?

Only the basic checks. You can safely try the steps above, but 41 usually points to a part or fault that needs a technician.

Other Fujitsu air conditioner codes

Last reviewed 2026-10-19. Codes and steps can vary by model; check your owner's manual.

Sources we checked